I also once made an impossible tic tac toe game, so I know how difficult it is.
However, This game is not completely impossible. If you begin, follow these steps to win:
1 | |
a b c
1. place first move on right side, centre (c, 2)
2. place 2nd move on left side, top (a, 3)
3. place 3rd move on right side, top (c, 3)
4. This will not always work as the robot chooses efferent places every time, but if you are lucky, both centre, top (b, 3) and right side, centre (c, 2) will give you three in a row. Robot will block one of them, you take the other to win.
Not fully impossible, but impressive.